Attachment for carburetors



Feb; 1o, 1942. B. SEYMOUR 2,272,389

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ATTACHMENT FOR CARBURETORS l Filed Jan. 5, 1939 Feb. 10, 1942.

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Feb. 10, 1942. c. B. SEYMOUR 2,272,386

ATTACHMENT FOR CARBURETORS Filed Jan. 5, 19:59 4'sheets-snqet s Feb. 10,1942. Q B SEYMOUR ATTACHMENT Fon CARBURETORS 4 Sheets-Sheet 4 Filed Jan.5, 1939 NIIIHIII v I l A lll ' dn*- TTORNEYS INVENT OR. Y

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Patented Feb. 10, 1942 2,272,386 ATTACHMENT FOR CAPABURETORS Clayton B.Seymour, Chicago, Ill., assignor to Hoof Products Company, a corporationof Illinois Application January 5, 1939, Serial No. 249,438

(Cl. 12S-119) 11 Claims.

My invention relates to improvements in fuel control mechanism andsimilar devices.

My invention relates more particularly to a fuel control means whichincludes in combination a carburetor having a manual throttle valve anda governor mechanism having an automatically controlled governor valve.

Since the introduction of automatic speed control governors intowidespread use upon trucks, busses and other vehicles driven vbyinternal combustion engines, or -even in connection with the use ofspeed control means on stationary internal combustion engines, certainproblems have arisen by reason of the fact that under certain conditionsof operation the flow of fuel into the internal combustion engine iscontrolled entirely by the automatic governor valve. In the fuel controlmeans of which I speak it is customary to have a manually controlledthrottle valve in the carburetor mechanism and an automaticallycontrolled governor valve in the fuel intake conduit ata point betweenthe carburetor valve and the intake manifold of the internal combustionengine. One type of governor to'which I refer may be similar to thatshown and described in the patent to Addison C. Hoof, No. 1,999,758 orany other similar type of suction or vacuum operated governors ormechanical governors. -Due to the fact that standard carburetors forvarious types of vehicles provide a control for the fuel supply, whichdepends upon the manual manipulation of the throttle in the carburetor,it canbe seen that when an automatic governor valve is disposedintheconduit to the manifold at a point between the carburetor and themanifold, under normal governing conditions the carburetor valve isnormally in a wide open position. Thus any fuel supply control which isregulated by the mechanism in the carburetor alone is either inoperativeor is operated without regard for the governed speed at which the fiowof fuel is controlled by the governor valve, and without regard to theload on the engine.

One of the carburetors of the type of which I speak is that shown `inthe patent to W. N. Ewart, No. 1,961,747. According to the constructionof this patent and a construction which is standard today on variousmakes of automobiles, the carburetor is provided with a metering rod orValve controlling a certain portion of the fuel supply to the engine andadapted to be moved into or out of an orifice to restrict or increase4the size thereof in accordance with the manual manipulation of theCarburetor 'speed of the engine and throttle valve. Thus, as I havepreviously mentioned, with a governor inserted between the` carburetorvalve andthe manifold and with the governor valve in control of thefuelsupply, the

carburetor valve is normally open and as a re-` sult there is noregulation of the flow ofvfuel tothe metering jet as there would be ifthe carburetor valve itself controlled the amount of fuel supply to theengine. I have also found that there are times when the governor valve-is not in control of the now of fuel to the intake manifold and underthese circumstances it is desirable that the carburetor valve beconnected to operate the metering rod.

The principal object of the present invention` is to provide anattachment for ak carburetor capable of being operated yin, accordancewith the pressures in the intake manifold of the engine to control' theoperation of the above mentioned metering rod.

A further object of the present invention is vto provide an attachmentfor a carburetor capable of being operated in accordance; with vthepressures in the intake vmanifold of the engine when the governor .is'in 'control of` the ow of fuel to control theoperation of. the abovementioned metering `rod,"and also capable of operation by the carburetorvalve during the time that the governor is not in'control of 'the fuelsupply.

A further object of the present invention 'is to provide an attachmentof the type described capable of being substitutediin standardcarburetors to elfectivelyand accurately'coritrol the supply of fuel inaccordance with the governed the load that is required to pull.

A further object of the present invention is' to providev an attachmentof the type described 40 which is capable of use with astandardilcarburetor and which will control the supply of fuel throughthemetering jetin accordance Awith lthe requirement of the enginewithout regard to whether a governor is used or not. Other objects andadvantages will be more l apparent from the following descriptionwherein reference is had to the accompanying four sheets of drawings,upon which Fig. 1 is a fragmentary side elevational view -showing aportion of the engine manifold, a

governor, and a carburetor with my improved attachment connectedtherewith;

Fig. 2 is a fragmentary plan view of the same parts shown in Fig. 1;

Fig. 3 isa fragmentary sectional view through changed position which itassumes under the v conditions shown in Fig. 4;

Fig. 5 is a fragmentary plan view of a modified construction of theinvention;

Fig. 6 is a vertical sectional view of the same taken generally on thelines B-B of Fig. 5 and Fig. 7 is a transverse sectional View of thesame form of construction taken generally on the lines 'I-'I of Fig. 5.

In the embodiment of the invention which I have chosen to illustrate, Ihave shown the usual carburetor C, manifold M and governor G disposedbetween the carburetor and the intake manifold. The carburetor isprovided with the customary manual throttle valve I and the governorwiththe customary offset Valve I2. The carburetor valve I0 4is mounted upona shaft I4 in the fuel conduit I6 ofthe carburetor. The

shaft may 4have a link I8 connected to one end of the same whichconnects with a rod that extends to the usual manual throttle control accelerator. The opposite end of the shaft I4 is provided with the usuallink 22 attached to the connector rod 24 which extends to a rocker arm23. The rocker arm 26 is adapted to operate the pump mechanism for quickacceleration according'to the usual well known construction.

In carburetors of the type which I have mentioned, a metering rod 28 isusually provided condrical 4opening 36 formed in the cover plate 38 forthe liquid fuel well 40 of the carburetor. In order to normally hold thepiston 34 in a raised position in the opening 36, I provide a conduit 44communicating with the opening 35 and extending outwardly to an enlargedboss 4S. suitable connector bushing 48, I connect a conduit to theopening. The conduit 50 may extend downwardly to a suitable connectorbushing 52 which provides a connection with the intake manifold 54.

The metering rod 28, aspreviously mentioned, is connected to the rigidarm 30 of the piston 34 and may extend downwardly through a suitablebore 56 in an elongated bearing 58 formed in the cover 38. The meteringrod 28 is formed with a `plurality of different sized metering portions29 which project into a reduced passageway 60 in a nut member 62screw-threadedly mounted in the base of the bowl 40. The passagewaycommunicat'es through passageways 64 and E6 with the main jet 68 of thecarburetor disposed in the usual manner centrally of the usual Venturiopenings of the carburetor.

In order to keep the metering rod 28 aligned in the bearing 58 andaxially in the opening 60,

With a I provide a spring member 'In having the parallel coils 10asecured about the nut member 62 and the upwardly tapered coils 10bterminating in a coil 10c of slightly larger diameter than the shank 23and continuing upwardly in an outwardly tapered portion 10d. With thisspring member it can be seen that the rod 28 will be normally,resiliently and yieldably held axially disposed in the opening 65, thusproviding under all conditions a circular passageway about the portion25 of the metering pin.

The governor valve I2 may be mounted upon the shaft I2a and connected inthe usual man ner to resistance means which may be of the type shown inthe patent to Hoof mentioned hereinbefore, adapted to permit completeclosure of the governor valve to a desired fuel conduit opening.

From the foregoing description it will be apparent that by removing thecover plate 3B heretofore found on carburetors of the type described andsubstituting the cover member which I have provided, together with itsassociated mechanism, I have provided a control for the metering rodattached directly to the manifold.

When the carburetor valve I0 is in an open position, such as shown inFig. 3, and the governor valve is not in a governing position, thespring 42 will be sufficient to prevent the suction in the manifold fromdrawing the piston 34 down or moving the metering rod to its lowermostposition. With the carburetor valve open andthe governor valve partiallyclosed and in a governing position, depending upon the load on theengine, suction below the governor valve in the intake manifold willovercome the spring 42 and draw the pistony 34 down in the cylindricalopening 36. This 'will move the metering rod to its lowermost positionor that shown in Fig. 4a, restricting the flow of fuel from the well 40.It will thus be obvious that as the governor valve swings back and forthfrom an open to a closed position, the metering rod will be moved up anddown, controlling the supply of fuel in accordance with the position ofthe governor valve.

From the above description it will'be obvious that with the attachmentwhich I have provided that the position of the metering rodlunder normalroad load conditions willdepend entirely upon the pressure conditions inthe intake manifold. It will also be obvious that while the provision ofthe unit which I have furnished becomes necessary when governors areemployed, that it can also be used Without the interposition of agovernor and efficiently control the supply of fuel without regard tothe manual operation of the foot throttle, depending upon the pressurecondition in the intake manifold.

It is sometimes desirable even, when a governor is employed, to permitmanual control of the position of the metering valve during that periodwhen the governor valve is not in control of the fuel supply.Accordingly in Figs. 5, 6, and 7 I have shown a modified form of theconstruction wherein I have provided an arm 12 extending sideways fromthe usual rocker arm 26 which is pivotally mounted upon the screw member'I4 and which is attached at its end to an accelerator plunger 16. Theend I8 of the rocker arm 26 is attached in the usual manner to theconnector rod 24 extending from the manual valve shaft I4.

By providing the arm I2 extending over the top of the piston 34 it canthus be seen that when the governor is not in control and the manualvalve is opened to permit high speed, the arm 'I2 is raised to permitthe spring 42 to raise the niston 34 and the metering rod 28. However,wh'en the speed of the vehicle is lowered and the carburetor valve ismoved to a closed position, the arm -12 will bear down upon the piston34 and by this means move the metering rod downwardly in tire well 40.It can thus be seen that at any time the vehicle is travelling at agoverned speed the metering rod is under the control of the vacuum inthe manifold and when the governor valve is not functioning due to thecooperation of the spring 42 and the arm 12, the metering rod at oncecomes under the control of the manifold .carburetor valve.

While I have illustrated and described a specific embodiment of myinvention, it will be apparent to those skilled in the art that changesand modications may be made in the exact details shown and I do not wishto limit myself in 'any particular. Rather, what I desire to secure andprotect by Letters Patent of the United States is:

1. Fuel control means for an internal combustion engine having an intakemanifold including av fuel mixture conduit, a carburetor having a manualthrottle valve in said fuel mixture conduit, and an automaticallycontrolled throttle valve in said conduit between said manual valve andsaid intake manifold; including means operable by said manual th'rottleto regulate the supply of liquid fuel to said conduit in accordance withthe throttle setting, and means operative when said automaticallycontrolled valve is in control and operable by pressure in said manifoldfor varying the supply of liquid to a value between the iiow determinedby said throttle f setting and a fixed minimum.

2. Fuel control means for an internal ccmbustion engine having an intakemanifold including a fuel mixture conduit, a carburetor having a manualthrottle valve in said fuel mixture conduit, and an automaticallycontrolled throttle valve in said conduit between said manual valve andsaid intake manifold; including means operable by said manual throttleto regulate the supply of liquid fuel to said conduit in accordance withthe throttle setting, and means operative when said automaticallycontrolled valve is in control and operable by pressure in said manifoldfor varying the supply of liquid to a value between the flow determinedby said throttle setting and a fixed minimum, said means including ametering rod in said carburetor and a piston connected th'ereto andsubject to the manifold pressure.

3. Fuel control means tion engine having an a fuel mixture conduit, acarburetor having a manual throttle valve in said fuel mixture conduit,and an automatically controlled throttle valve in said conduit betweensaid manual valve and said intake manifold; includ-ing means opfor aninternal combuserable by said manual throttle to regulate theA supply ofliquid fuel to said conduit in accordance with the throttle setting, andmeans operative when said automatically controlled valve is in controland operable by pressure in said manifold for varying the supply ofliquid to a value between the flow determined by said throttle settingand a fixed minimum, said means including a metering rod in saidcarburetor and a piston connected thereto and subject to the manifoldpressure to move the metering rod in one direction and resilient meansfor moving the rod in an opposite direction.

4. The combination intake manifold including with an internal combusntion engine having an intake manifold, a. fuel mixture conduit, agovernor having an automatically balanced valve, a carburetor having amanual valve in said conduit, said carburetor having a liquid fuel well,a metering jet and a metering rod associated therewith and movable withrespect to the jet, a cover for said fuel well, means on said covervconnected to' said metering rod for regulating Vthe fiow of fuel pastsaid rod in accordance with the pressure in the intake manifold of saidengine and resilient centering means in said carburetor flxedly disposedwith respect to said jet and embracing said metering rod, said meteringrod being freely axially movable with respect thereto.

5. The combination with an internal combustion engine Vhaving an intakemanifold, a .fuel mixture conduit, a governor having an automaticallybalanced valve, a carburetor having a manual valve in said conduit, saidcarburetor h'aving a liquid fuel well, a metering jet and a metering rodassociated therewith and movable with respect to the jet, a spiralspring member fixedlyl mounted with respect to said jet and surroundingsaid metering rod in guiding relationship and resiliently centering thesame in said metering jet, a cover for said fuel well and means on saidcover connected to said metering rod for regulating the flow of fuelpast said rod in accordance with the pressure in the intake manifold ofsaid engine.

6. In a carburetor for association with the intake manifold of aninternal combustion engine, said Acarburetor having a manual throttlelocated in a fuel mixture conduit, means operable by said manualthrottle to regulate the supply of liquid fuel to said conduit inaccordance with the throttle setting, and means operable by pressure inthe intake manifold for varying the supply of liquid fuel to a valuebetween the flow determined by said throttle setting and a fixedpredetermined minimum flow.

7. In a carburetor for association with the intake manifold of aninternal combustion engine, said carburetor having a manual throttlelocated in a fuel mixture conduit, means operable by said manualthrottle to regulate the supply of liquid fuel to said conduit inaccordance with the throttle setting, a metering valve for controllingfuel flow to said conduit, means responsive to predetermined manifoldvacuum conditions at all open positions of the throttle for shifting themetering valve to a fixed minimum ow restricting position, andadditional means for shifting said metering valve in response tomovement of the manual throttle.

8. In a carburetor for association with the intake manifold of aninternal combustion engine, said carburetor having a manual throttlelocated in a fuel mixture conduit, means operable by said manualthrottle to regulate the supply of liquid fuel to said conduit inaccordance with the throttle setting,`a metering valve for controllingfuel fiow to said conduit, means responsive to predetermined manifoldvacuum conditions at all open positions of the throttle for shifting themetering valve to a fixed minimum flow restricting position, andadditional means for shifting said metering valve in response tomovement of the manual throttle, said additional means comprising a lostmotion connection whereby the metering valve is responsive to said firstnamed means when said additional means is not in control.

9. In a carburetor for association with the intake manifold of aninternal combustion engine, said carburetor having a manual throttlelocated in a fuel mixture conduit, means operable by said manualthrottle to regulate the supply of liquid fuel to said conduitinaccordance with the throttle setting, a metering valve for controllingfuel ow to said conduit, means responsive to predetermined manifoldvacuum conditions at all openV positions of the throttle for shiftingthe metering valve to a xed minimum ilow restricting position, andadditional means for shifting said metering valve in response tomovement of the manual throttle, said first named means being operativeat all times to locate the valve in any operative position between theposition determined by the location of the manual throttle and said xedminimum.

l0. In a construction for internal combustion engine carburetors adaptedfor association With the intake manifold of an internal combustionengine, a unit comprising supporting plate means, a suction responsivemember associated with said supporting plate and having a conduitleading therefrom for communication with the intake manifold of saidinternal combustion engine, means connected with said suction responsivemeans for attachment with a carburetor metering rod and operative toshift said rod to minimum flow restricting position in response topredetermined manifold vacuum, a shiftable member mounted on said platemeans for movement in response to movement of the carburetor throttlevalve, and means on said shiftable member extending into operativerelationship with said metering rod attachment means for determining themaximum open position of said metering rod independently of said suctionmeans and in accordance with the degree of opening of the manualthrottle.

l1. In a carburetor construction having a fuel mixture conduit and athrottle, means for metering fuel ow, means connected with said throttlefor holding said metering means in substantially minimum ow restrictingposition when the throttle is substantially closed and operable topermit movement of said metering means toward open position inaccordance with the degree of opening of the throttle, and vacuumresponsive means responsive to manifold vacuum conditions for adjustingsaid metering means to a position between said position determined bythe degree of opening of the throttle and fixed minimum position.

CLAYTON B. SEYMOUR.

